Hi Wang, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 1588d318a9e388d05b6cf5e2a63134c8beb6a355 commit: 66ae8ddda388386daea0623a65ea2ac85c24ca00 [3415/3415] ascend/arm64: Add ascend_enable_all kernel parameter config: arm64-allnoconfig (https://download.01.org/0day-ci/archive/20251222/202512220606.726hmC01-lkp@i...) compiler: aarch64-linux-gcc (GCC) 15.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251222/202512220606.726hmC01-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202512220606.726hmC01-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

arch/arm64/mm/init.c:730:6: warning: no previous prototype for 'ascend_enable_all_features' [-Wmissing-prototypes] 730 | void ascend_enable_all_features(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/ascend_enable_all_features +730 arch/arm64/mm/init.c 729

730 void ascend_enable_all_features(void) 731 { 732 if (IS_ENABLED(CONFIG_ASCEND_DVPP_MMAP)) 733 enable_mmap_dvpp = 1; 734

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